I slept so little last night and I can tell you that after the evening I'd had, (I need not repeat that I hope) I figured I needed to load up on anti-inflammatory and pain medication. It did not do a thing. Nothing. It was not, refreshingly, my back that was the problem, but my very abused bottom, which made the whole night a total misery of tossing and turning (very gently) in the endless and fruitless search for a comfortable sleeping position.
I daresay I should sleep like a baby tonight!